In parasitic wasp successively released areas where 4 consecutive generations of H. cunea were studied, the damage caused by Fall Webworm decreased but in control areas the damage had no change.

在连续对4代美国白蛾进行放蜂的防治区，美国白蛾的危害下降，而对照区美国白蛾仍造成一定的危害。

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In parasitic wasp successively released areas where 4 consecutive generations of H. cunea were studied, the damage caused by Fall Webworm decreased but in control areas the damage had no change.

在连续对4代美国白蛾进行放蜂的防治区，美国白蛾的危害下降，而对照区美国白蛾仍造成一定的危害。

youdao